private void canvas_CreateResources(Microsoft.Graphics.Canvas.UI.Xaml.CanvasControl sender, Microsoft.Graphics.Canvas.UI.CanvasCreateResourcesEventArgs args)
//Yet more boilerplate code, this runs before canvas_Draw and is meant to be used to load any assets that need to be loaded from files
{
Board = LoadAsset(sender, "Chess Board"); //These are all basically identical; they set the value of each variable to whatever LoadAsset returns given the file name.
PawnBlack = LoadAsset(sender, "PawnBlack");
PawnWhite = LoadAsset(sender, "PawnWhite");
KnightBlack = LoadAsset(sender, "KnightBlack");
KnightWhite = LoadAsset(sender, "KnightWhite");
BishopBlack = LoadAsset(sender, "BishopBlack");
BishopWhite = LoadAsset(sender, "BishopWhite");
RookBlack = LoadAsset(sender, "RookBlack");
RookWhite = LoadAsset(sender, "RookWhite");
QueenBlack = LoadAsset(sender, "QueenBlack");
QueenWhite = LoadAsset(sender, "QueenWhite");
KingBlack = LoadAsset(sender, "KingBlack");
KingWhite = LoadAsset(sender, "KingWhite");
PlaceholderBlack = CanvasSvgDocument.LoadFromXml(sender, PawnBlack.GetXml().Replace("opacity=\"1\"", "opacity=\"0.5\""));
PlaceholderWhite = CanvasSvgDocument.LoadFromXml(sender, PawnWhite.GetXml().Replace("opacity=\"1\"", "opacity=\"0.5\""));
translator = new RenderTranslator(PawnBlack, PawnWhite, KnightBlack, KnightWhite, BishopBlack, BishopWhite, RookBlack, RookWhite, QueenBlack, QueenWhite, KingBlack, KingWhite, PlaceholderBlack, PlaceholderWhite);
pieceSize = new Size(sender.Size.Width / 16, sender.Size.Height / 16);
pawn = new Pawn(new Position(3, 3), true);
MoveHighlight = new Color();
MoveHighlight.A = 100;
MoveHighlight.R = 255;
MoveHighlight.G = 255;
MoveHighlight.B = 255;
}
public static Task WriteSvgAsync(CanvasSvgDocument document, IStorageFile file)
{
StringBuilder sb = new StringBuilder();
sb.AppendLine("<!-- Exported by Character Map UWP -->");
sb.Append(document.GetXml());
return(FileIO.WriteTextAsync(file, sb.ToString()).AsTask());
}
public static Task WriteSvgAsync(CanvasSvgDocument document, IStorageFile file)
{
return(WriteSvgAsync(document.GetXml(), file));
}
public static string GetSVG(
ExportStyle style,
CharacterRenderingOptions options,
Character selectedChar)
{
// We want to prepare geometry at 1024px, so force this
options = options with {
FontSize = 1024
};
using var typography = options.CreateCanvasTypography();
CanvasDevice device = Utils.CanvasDevice;
Color textColor = style == ExportStyle.Black ? Colors.Black : Colors.White;
// If COLR format (e.g. Segoe UI Emoji), we have special export path.
if (style == ExportStyle.ColorGlyph && options.Analysis.HasColorGlyphs && !options.Analysis.GlyphFormats.Contains(GlyphImageFormat.Svg))
{
NativeInterop interop = Utils.GetInterop();
List <string> paths = new List <string>();
Rect bounds = Rect.Empty;
// Try to find the bounding box of all glyph layers combined
foreach (var thing in options.Analysis.Indicies)
{
var path = interop.GetPathDatas(options.Variant.FontFace, thing.ToArray()).First();
paths.Add(path.Path);
if (!path.Bounds.IsEmpty)
{
var left = Math.Min(bounds.Left, path.Bounds.Left);
var top = Math.Min(bounds.Top, path.Bounds.Top);
var right = Math.Max(bounds.Right, path.Bounds.Right);
var bottom = Math.Max(bounds.Bottom, path.Bounds.Bottom);
bounds = new Rect(
left,
top,
right - left,
bottom - top);
}
}
using CanvasSvgDocument document = Utils.GenerateSvgDocument(device, bounds, paths, options.Analysis.Colors, invertBounds: false);
return(document.GetXml());
}
var data = GetGeometry(selectedChar, options);
string GetMonochrome()
{
using CanvasSvgDocument document = string.IsNullOrWhiteSpace(data.Path)
? new CanvasSvgDocument(Utils.CanvasDevice)
: Utils.GenerateSvgDocument(device, data.Bounds, data.Path, textColor);
return(document.GetXml());
}
// If the font uses SVG glyphs, we can extract the raw SVG from the font file
if (options.Analysis.GlyphFormats.Contains(GlyphImageFormat.Svg))
{
string str = null;
IBuffer b = GetGlyphBuffer(options.Variant.FontFace, selectedChar.UnicodeIndex, GlyphImageFormat.Svg);
if (b.Length > 2 && b.GetByte(0) == 31 && b.GetByte(1) == 139)
{
using var stream = b.AsStream();
using var gzip = new GZipStream(stream, CompressionMode.Decompress);
using var reader = new StreamReader(gzip);
str = reader.ReadToEnd();
}
else
{
using var dataReader = DataReader.FromBuffer(b);
dataReader.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf8;
str = dataReader.ReadString(b.Length);
}
if (str.StartsWith("<?xml"))
{
str = str.Remove(0, str.IndexOf(">") + 1);
}
str = str.TrimStart();
try
{
using (CanvasSvgDocument document = CanvasSvgDocument.LoadFromXml(Utils.CanvasDevice, str))
{
// We need to transform the SVG to fit within the default document bounds, as characters
// are based *above* the base origin of (0,0) as (0,0) is the Baseline (bottom left) position for a character,
// so by default a will appear out of bounds of the default SVG viewport (towards top left).
//if (!document.Root.IsAttributeSpecified("viewBox")) // Specified viewbox requires baseline transform?
{
// We'll regroup all the elements inside a "g" / group tag,
// and apply a transform to the "g" tag to try and put in
// in the correct place. There's probably a more accurate way
// to do this by directly setting the root viewBox, if anyone
// can find the correct calculation...
List <ICanvasSvgElement> elements = new List <ICanvasSvgElement>();
double minTop = 0;
double minLeft = double.MaxValue;
double maxWidth = double.MinValue;
double maxHeight = double.MinValue;
void ProcessChildren(CanvasSvgNamedElement root)
{
CanvasSvgNamedElement ele = root.FirstChild as CanvasSvgNamedElement;
while (true)
{
CanvasSvgNamedElement next = root.GetNextSibling(ele) as CanvasSvgNamedElement;
if (ele.Tag == "g")
{
ProcessChildren(ele);
}
else if (ele.Tag == "path")
{
// Create a XAML geometry to try and find the bounds of each character
// Probably more efficient to do in Win2D, but far less code to do with XAML.
Geometry gm = XamlBindingHelper.ConvertValue(typeof(Geometry), ele.GetStringAttribute("d")) as Geometry;
minTop = Math.Min(minTop, gm.Bounds.Top);
minLeft = Math.Min(minLeft, gm.Bounds.Left);
maxWidth = Math.Max(maxWidth, gm.Bounds.Width);
maxHeight = Math.Max(maxHeight, gm.Bounds.Height);
}
ele = next;
if (ele == null)
{
break;
}
}
}
ProcessChildren(document.Root);
double top = minTop < 0 ? minTop : 0;
double left = minLeft;
document.Root.SetRectangleAttribute("viewBox", new Rect(left, top, data.Bounds.Width, data.Bounds.Height));
}
return(document.GetXml());
}
}
catch
{
// Certain fonts seem to have their SVG glyphs encoded with... I don't even know what encoding.
// for example: https://github.com/adobe-fonts/emojione-color
// In these cases, fallback to monochrome black
return(GetMonochrome());
}
}
else
{
return(GetMonochrome());
}
}